If he's reusing all the same parts, and just changing knuckles, theres no issues with spindles. the ONLY thing you run into is a difference in where the tie-rod attaches

on 10bolt knuckles, the tie-rod attaches from the bottom of the steering arm, on flat tops, it's from above. If you're going to run a tie-rod in the stock location with flat top knuckles, it sits REAL close to the leaf springs. so close you have to put the tie-rod ends into the knuckles, then thread the center piece into them. No room to put the whole assembly in in one piece!

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